CN114497766B - Chain type energy storage system - Google Patents
Chain type energy storage system Download PDFInfo
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- CN114497766B CN114497766B CN202111670716.9A CN202111670716A CN114497766B CN 114497766 B CN114497766 B CN 114497766B CN 202111670716 A CN202111670716 A CN 202111670716A CN 114497766 B CN114497766 B CN 114497766B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present application relates to a chain energy storage system. The chained energy storage system comprises a power conversion valve group, a battery array and a metal shell, wherein the power conversion valve group comprises a plurality of power modules, the battery array comprises a plurality of battery cluster modules, and the power modules and the battery modules are all arranged in the metal shell; each power module is connected with one battery module in parallel, and the connection point of the power module and the battery module is connected with the metal shell. The scheme makes the metal shell become a part of the whole high-voltage charged body, avoids the metal shell from generating induced charges, and when the energy storage system works in a high-voltage environment, the internal conductive parts of the power module completely determine reliable electric potential, and no suspension point exists in the high-voltage environment, so that the induced charges generated by the conductive parts in the high-voltage electric field can be effectively released, discharge faults are prevented, and the operation safety of the chain energy storage system is ensured.
Description
Technical Field
The application relates to the technical field of high-voltage energy storage, in particular to a chain type energy storage system.
Background
The energy storage system has excellent charge and discharge capability, is widely applied to a power grid, has unique power generation and power storage bidirectional regulation effects, can improve the capacity of the power grid for receiving renewable new energy sources for grid-connected power generation, can effectively solve the problems of load change of the power system and power access of the new energy sources, and keeps efficient and safe operation of the power grid and balance of power supply and demand. With the increasing of large-scale renewable new energy grid-connected capacity, the energy storage system is used as effective equipment for smoothing the fluctuation of renewable energy output, the capacity of the energy storage system connected to a power grid is larger, and the voltage class is higher. The high-voltage cascade H-bridge multi-level converter is matched with a chain energy storage system formed by energy storage battery clusters.
Through cascade connection of a plurality of low-voltage subunit modules, the chain energy storage system has the capability of being directly connected into a high-voltage distribution network. The chain type energy storage system does not need to be provided with a step-up transformer in a conventional low-voltage energy storage system, so that the loss of the energy storage system is reduced, the equipment investment and the hidden trouble are reduced, and the economical efficiency is improved. Based on the topological scheme of cascade connection of a plurality of low-voltage subunit modules of chain energy storage and the distributed configuration characteristic of energy storage battery clusters, the design of the battery energy management system becomes simple and convenient, and simultaneously, the capacity expansion of the energy storage system is simpler and more convenient. Therefore, the chain type energy storage system has particularly good development prospect in the field of high-voltage large-capacity energy storage systems, but no chain type energy storage system capable of safely operating in a high-voltage environment exists at present.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a chain energy storage system that can safely operate in a high-pressure environment.
Embodiments of the present application provide a chain energy storage system comprising: the power conversion valve bank comprises a plurality of power modules, a battery array and a metal shell, wherein the battery array comprises a plurality of battery cluster modules, and the power modules and the battery modules are arranged in the metal shell; each power module is connected with one battery module in parallel, and the connection point of the power module and the battery module is connected with the metal shell.
The chain type energy storage system is characterized in that the metal shell is connected with the connection point of the power module and the battery cluster module, so that the metal shell becomes a part of the whole high-voltage electrified body, induced charges are prevented from being generated by the metal shell, when the energy storage system works in a high-voltage environment, all conductive parts in the power module determine reliable electric potentials, no suspension point exists in the high-voltage environment, the induced charges generated by the conductive parts in the high-voltage electric field can be effectively released, discharge faults are prevented, and the operation safety of the chain type energy storage system is ensured.
In one embodiment, the connection points include an anode connection point and a cathode connection point, a first resistor is connected between the anode connection point and the metal shell, a second resistor is connected between the cathode connection point and the metal shell, and the resistance value of the first resistor is equal to that of the second resistor.
In one embodiment, the metal casing comprises a first metal casing and a second metal casing, the power module, the first resistor and the second resistor are arranged in the first metal casing, and the first metal casing is connected with a series midpoint of the first resistor and the second resistor; the battery cluster module comprises a plurality of energy storage batteries, each energy storage battery is respectively arranged in a second metal shell, and a third resistor is connected between the second metal shell and the connecting point.
In one embodiment, the power module includes: the H-bridge circuit, the direct-current capacitor, the control driving unit, the power controller and the driving control power supply; the H bridge circuit is connected with the direct-current capacitor in parallel, a switching tube of the H bridge circuit is connected with the control driving unit, the control driving unit is connected with the power controller through optical fibers, and the control driving unit is connected with the secondary side of the driving control power supply; the primary side of the drive control power supply is connected with the direct current capacitor in parallel.
In one embodiment, the battery further comprises a metal bracket, the plurality of energy storage batteries are arranged on the metal bracket, and the metal bracket is in contact with the second metal shell.
In one embodiment, the system further comprises an energy storage battery cluster fire protection system, the energy storage battery cluster fire protection system comprising:
the fire control monitoring module is used for acquiring the environmental data of the battery cluster module;
the fire control controller is connected with the fire control monitoring module and is used for outputting control signals according to the environmental data;
and the fire control execution module is connected with the fire control controller and is used for alarming according to the control signal or executing fire control actions on the energy storage batteries of the battery cluster module.
In one embodiment, the energy storage battery cluster fire protection system further comprises a relay module, a first photoelectric conversion module and a second photoelectric conversion module, wherein the relay module is respectively connected with the fire protection monitoring module, the fire protection executing module and the first photoelectric conversion module, and the first photoelectric conversion module is connected with the second photoelectric conversion module through optical fibers; the second photoelectric conversion module is connected with the fire control controller.
In one embodiment, the fire protection execution module includes: the fire extinguishing agent comprises a fire extinguishing agent container, a fire extinguishing agent pump, a fire extinguishing pipeline, a pipeline electric control valve and a fire extinguishing host; the fire extinguishing agent container is used for storing fire extinguishing agent, the fire extinguishing agent pump is connected with the fire extinguishing agent container and the fire extinguishing pipeline, and the fire extinguishing agent pump is used for conveying the fire extinguishing agent into the fire extinguishing pipeline; the fire line extends from the fire suppressant pump to the battery cluster module; the pipeline electric control valve is arranged on the fire-fighting pipeline and is used for controlling the on-off of the fire-fighting pipeline; the fire-fighting host is respectively connected with the pipeline electric control valve, the fire-extinguishing agent pump and the fire-fighting controller, and is used for controlling the fire-extinguishing agent pump to be started and the pipeline electric control valve to be started according to the control signal so as to convey the fire-extinguishing agent pump to the energy storage battery of the battery cluster module.
In one embodiment, the system further comprises a battery energy management module, wherein the battery energy management module comprises a battery management unit, a third photoelectric conversion module, a fourth photoelectric conversion module and a battery controller; the battery management unit is connected with the third photoelectric conversion module and is used for monitoring the working state of the energy storage battery, the third photoelectric conversion module is connected with the fourth photoelectric conversion module through optical fibers, and the fourth photoelectric conversion module is connected with the battery controller; the battery controller is used for acquiring and controlling the working state of the energy storage battery.
In one embodiment, the power module further comprises a first insulating support, the power modules are connected in series, and the power modules are all arranged on the first insulating support.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of the general circuit connection structure of a chain-type energy storage system in one embodiment;
FIG. 2 is a schematic diagram of a circuit connection structure between a power module and a battery cluster module according to an embodiment;
FIG. 3 is a top view of the overall mechanical structure of a chain energy storage system according to one embodiment;
FIG. 4 is a schematic diagram of a circuit connection structure between a power module and a battery cluster module according to another embodiment;
FIG. 5 is a mechanical perspective view of a power module and a first metal housing in one embodiment;
FIG. 6 is a mechanical perspective view of a battery cluster module in one embodiment;
FIG. 7 is a mechanical perspective view of a power conversion valve block in one embodiment;
fig. 8 is a perspective view of a portion of the mechanical structure of a fire protection system in one embodiment.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It is to be understood that the terms "first," "second," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. The terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. Furthermore, in the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. In the description of the present application, the meaning of "several" means at least one, such as one, two, etc., unless explicitly defined otherwise.
Spatially relative terms, such as "under", "below", "beneath", "under", "above", "over" and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "below" and "under" may include both an upper and a lower orientation. Furthermore, the device may also include an additional orientation (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments should be understood as "electrical connection", "communication connection", and the like if there is transmission of electrical signals or data between objects to be connected.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
When the chained energy storage system is used for low-voltage energy storage equipment, the shells of the power module and the battery cluster module are metal shells, and the metal shells are required to be grounded so that the potential of the metal shells is zero. In the high-voltage energy storage device, the power module and the housing of the battery cluster module are still made of metal, and at this time, if the metal housing is grounded, the electrical safety distance required by high voltage needs to be kept between the power module and the metal housing of the battery cluster module, so that the volume of the chain type energy storage system is greatly increased, and the cost and the processing difficulty are increased. If the metal casing of the power module and the battery cluster module is not grounded, under the high-voltage environment, the metal material in the metal casing is polarized by the electric field, so that a potential difference is generated between the metal casing and the electric field, and when the potential difference exceeds a certain value, some non-equipotential conductors similar to the metal frame are easy to discharge with the non-equipotential conductors. The impact of discharging in a high voltage environment on battery performance and safety is currently not specifically standard-rated, but high voltage discharge is avoided as much as possible. In addition, after the equipment is stopped, the high-voltage electric field disappears, and charges generated by induction on the metal shell can be completely dissipated only for a certain period of time, so that the charges which cannot be timely dissipated also have a certain safety threat to maintenance and debugging personnel.
For the reasons, the metal shell can not be grounded or connected with the cathode of the battery through a resistor, so that the metal of the outer frame becomes a part of the whole high-voltage charged body, induced charges can not be generated, the voltage of the frame is consistent with that of the battery cluster, the insulation distance is designed, and the design of the safety distance can be achieved.
In one embodiment, as shown in fig. 1, 2 and 3, a chained energy storage system is provided, which comprises a power conversion valve set 1, a battery array 2 and a metal shell, wherein the power conversion valve set 1 comprises a plurality of power modules 11, the battery array 2 comprises a plurality of battery cluster modules 21, and the plurality of power modules 11 and the plurality of battery modules are arranged in the metal shell; each power module 11 is connected in parallel with one battery module, and the connection point a of the power module 11 and the battery module is connected with the metal housing.
Specifically, the chain energy storage system mainly comprises three-phase line unit modules respectively connected to the high-voltage power grid, and each unit module comprises a power conversion valve group 1 formed by connecting a plurality of power modules 11 in series, and a plurality of battery cluster modules 21 respectively connected with each power module 11 in parallel. The power conversion valve group 1 is formed by connecting a plurality of power modules 11 in series, each power module 11 is connected with a battery cluster module 21 in parallel, the power modules 11 and the battery cluster modules 21 are all arranged in a metal shell, and the power modules 11 and the battery cluster modules 21 can be arranged in the same metal shell or in a plurality of metal shells respectively. The metal housing can protect the devices inside from the external environment. Each power module 11 is connected in parallel with one battery cluster module 21, and one power module 11 and one battery cluster module 21 form one subunit module of the chain energy storage device. The connection point a of the power module 11 and the battery module is connected to the metal case so that the potential of the metal case and the connection point a are equal.
In the above embodiment, the metal casing is connected with the connection point a of the power module 11 and the battery cluster module 21, so that the metal casing becomes a part of the whole high-voltage charged body, the induction charges generated by the metal casing are avoided, when the energy storage system works in a high-voltage environment, the internal conductive parts of the power module 11 completely determine reliable potentials, and no suspension point exists in the high-voltage environment, so that the induction charges generated by the conductive parts in the high-voltage electric field can be effectively released, discharge faults are prevented, and the operation safety of the chain type energy storage system is ensured. Meanwhile, the power module and the corresponding battery cluster module are indirectly connected through the negative electrode connecting cable, so that the potential of the mechanical structural part inside the power module and the battery cluster module is guaranteed to have certain correlation and can be controlled in calculation.
In one embodiment, as shown in fig. 4, the connection point a includes a positive connection point A1 and a negative connection point A2, a first resistor R1 is connected between the positive connection point A1 and the metal casing, a second resistor R2 is connected between the negative connection point A2 and the metal casing, and the resistance value of the first resistor R1 is equal to the resistance value of the second resistor R2.
In this embodiment, the metal casing is not directly connected to the battery cluster module 21, and the first resistor R1 and the second resistor R2 are disposed between the metal casing and the positive electrode connection point A1 and the negative electrode connection point A2, respectively, and the resistance of the first resistor R1 is equal to the resistance of the second resistor R2, so that the voltage difference between the serial midpoint of the first resistor R1 and the second resistor R2 and the positive electrode and the negative electrode of the capacitor is 1/2 of the capacitor voltage, so that the safety distance between the first metal casing 31 and other charged components is as small as possible after the equipotential connection, which is conducive to electrical safety design.
In some embodiments, the negative connection point A2 of the power module 11 and the battery module is connected with a metal case.
Because the metal shell is also provided with other devices, the working voltage of the devices is lower, if the metal shell is connected with the positive electrode connecting point A1, the potential of the metal shell is higher, and a separator is required to be arranged between the other devices and the metal shell, so that the metal shell is connected with the negative electrode connecting point A2, the potential of the metal shell is reduced, and the normal operation of the other devices can be ensured without arranging the separator.
In one embodiment, as shown in fig. 4 and 5, the metal housing includes a first metal housing 31 and a second metal housing, the power module 11, the first resistor R1, and the second resistor R2 are disposed in the first metal housing 31, and the first metal housing 31 is connected with a series midpoint of the first resistor R1 and the second resistor R2; the battery cluster module 21 includes a plurality of energy storage batteries E disposed in a second metal case, and a third resistor R3 is connected between the second metal case and the connection point a.
Specifically, in the actual setting, the power module 11 and the battery cluster module 21 are separately disposed and may be far apart due to the large volume of the battery cluster module 21, and the power module 11 and the battery in the battery cluster module 21 are loaded with different metal cases. Each power module 11 is individually disposed within a first metal housing 31. The battery cluster module 21 includes a plurality of energy storage batteries E, and the plurality of energy storage batteries E are connected in series and then connected in parallel with the power module 11, and the second metal housing may be a plurality of or one, and the plurality of energy storage batteries E may be disposed in the same second metal housing, or one energy storage battery E may be correspondingly mounted in one second metal housing. The second metal casing is connected to the positive electrode or the negative electrode of the battery cluster module 21, that is, the connection point A1 or the connection point A2 of the second metal casing and the positive electrode, and the third resistor R3 is connected between the connection point A1 or the connection point A2 of the second metal casing and the positive electrode, so as to reduce the potential of the second metal casing. This reduces the use of cables when the power module 11 is located at a greater distance from the battery cluster module 21.
In one embodiment, as shown in fig. 4 and 5, the power module 11 includes: an H-bridge circuit 111, a dc capacitor C, a control drive unit 112, a power controller 113, and a drive control power supply 114; the H bridge circuit 111 is connected in parallel with the direct-current capacitor C, a switching tube of the H bridge circuit 111 is connected with the control driving unit 112, the control driving unit 112 is connected with the power controller 113 through an optical fiber, and the control driving unit 112 is connected with the secondary side of the drive control power supply 114; the primary side of the drive control power supply 114 is connected in parallel with a dc capacitor C.
Specifically, the H-bridge circuit 111 is composed of four switching tubes, which may be switching tubes of insulated gate bipolar transistors capable of controlling on-off of the circuit, two ends of two bridge arms of the H-bridge circuit 111 are respectively connected with two ends of the dc capacitor C, and a junction between two switching tubes on each bridge arm is connected with an adjacent power module 11. The driving end of the control driving unit 112 is connected with the base electrode of the switching tube of the H bridge through a flat cable, the communication end of the control driving unit 112 is connected with the power controller 113 through an optical fiber, and the power controller 113 is used for driving and controlling the driving unit 112 to control the on-off of the switching tube. The driving control power supply 114 is a transformer, the primary side of the driving control power supply 114 is connected in parallel with the dc capacitor C, and the secondary side of the driving control power supply 114 is connected with a unit for controlling driving, so that the driving control power supply 114 can obtain electric energy from the dc capacitor C, and after the voltage of the driving control power supply 114 is adjusted, the electric energy is output to the control driving unit 112 to supply power 113 and 112 to the control driving unit 112 through optical fibers.
In one embodiment, as shown in fig. 6, further comprising a metal bracket 41, a plurality of energy storage cells E are disposed on the metal bracket 41, and the metal bracket 41 is in contact with the second metal housing.
Specifically, the energy storage cells E in the battery cluster modules 21 are mounted on the metal bracket 41, and each battery cluster module 21 is placed by using one metal bracket 41, and the metal bracket 41 is in contact with the second metal housing, that is, the metal bracket 41 is connected with the second metal housing in an equipotential manner. So that the whole battery cluster module 21 and the surrounding metal parts become a part of the whole high-voltage charged body, thereby further ensuring the operation safety of the chain energy storage system.
In one embodiment, as shown in fig. 3, 6 and 8, further comprising an energy storage battery cluster fire protection system, the energy storage battery cluster fire protection system comprising: a fire monitoring module 51, a fire controller 52, and a fire execution module; the fire monitoring module 51 is configured to obtain environmental data of the battery cluster module 21; the fire control controller 52 is connected with the fire monitoring module 51 and is used for outputting control signals according to environmental data; the fire-fighting execution module is connected with the fire-fighting controller 52 for alarming or executing fire-fighting actions on the energy storage batteries E of the battery cluster module 21 according to the control signal.
Specifically, the energy storage battery cluster fire protection system is used for carrying out danger avoiding actions when the batteries in the battery cluster module 21 are dangerous. The fire monitoring module 51 is mounted on the metal bracket 41, and is configured to obtain environmental data of the energy storage battery E cluster, where the environmental data may specifically include temperature data, gas data (such as concentration of carbon monoxide), and state of charge, etc., and the environmental data may be changed to know dangerous situations of the surrounding environment due to changes of the temperature, gas, and state of charge around the energy storage battery E after the fire. The fire monitoring module 51 may be composed of a variety of sensors, and may be specifically determined according to the type of data to be monitored. The fire control controller 52 is a general control center of the entire fire control system, acquires environmental data through the fire monitoring module 51, and determines whether the environment of the current energy storage battery E has a potential safety hazard or whether a dangerous situation has occurred according to the environmental data. The fire control controller 52 can specifically determine the current danger level according to whether the environmental data exceeds a certain threshold value, and control the fire control execution module to take different measures to eliminate danger according to the danger level, for example, the danger level is divided into a first level, a second level and a third level, and the measures corresponding to the three levels in sequence are early warning, alarming, acousto-optic warning and executing fire control actions. Fire action refers to an action taken to solve a safety problem after the safety problem occurs, for example, if the energy storage battery E has a fire, the fire control controller 52 controls the fire execution module to take a fire extinguishing action.
In one embodiment, the energy storage battery E-cluster fire protection system further includes a relay module 54, a first photoelectric conversion module 55, and a second photoelectric conversion module, where the relay module 54 is connected to the fire protection monitoring module 51, the fire protection execution module, and the first photoelectric conversion module 55 is connected to the second photoelectric conversion module through an optical fiber; the second photoelectric conversion module is connected to the fire controller 52.
Specifically, the relay module 54 is a module for connecting two different devices, after the fire monitor module 51 obtains the environmental data, the environmental data is converted into corresponding electrical data, the relay module 54 converts the electrical data into optical data through the first photoelectric conversion module 55, the optical data is transmitted to the second photoelectric conversion module through the optical fiber, and the second photoelectric conversion module converts the optical data into electrical data and outputs the electrical data to the fire controller 52; if the fire control controller 52 determines a control signal to the fire control execution module according to the acquired electrical data, the control signal is transmitted to the fire control execution module through the second photoelectric conversion module, the first photoelectric conversion module 55, and the relay module 54. Because the optical signal transmission is not affected by the high-voltage environment, the stability of the signal transmission is ensured, and the operation safety of the chain energy storage system is ensured. In some embodiments, a relay module 54, a first photoelectric conversion module 55 is disposed on the metal bracket 41 and a second photoelectric conversion module is mounted proximate to the fire controller 52.
In one embodiment, the fire execution module includes: fire extinguishing agent tank 53, fire extinguishing agent pump, fire fighting line 532, line electrically controlled valve 533, and fire fighting host 534; the fire extinguishing agent container 53 stores fire extinguishing agent, and a fire extinguishing agent pump is connected to the fire extinguishing agent container 53 and the fire extinguishing line 532, and is used for delivering the fire extinguishing agent into the fire extinguishing line 532; fire line 532 extends from the fire suppression agent pump to energy storage battery E; the pipeline electric control valve 533 is arranged on the fire-fighting pipeline 532, and the pipeline electric control valve 533 is used for controlling the on-off of the fire-fighting pipeline 532; the fire-fighting host 534 is respectively connected with the pipeline electric control valve 533, the fire-extinguishing agent pump and the fire-fighting controller 52, and the fire-fighting host 534 is used for controlling the fire-extinguishing agent pump to be opened and the pipeline electric control valve 533 to be opened according to the control signal so as to convey the fire-extinguishing agent pump to the energy storage battery E.
Specifically, after the energy storage battery E generates a flame, a fire extinguishing measure needs to be taken, and the fire extinguishing execution module transmits the fire extinguishing agent to the energy storage battery E needing fire extinguishing. The fire extinguishing agent tank 53 contains a fire extinguishing agent. The fire-fighting pipeline 532 extends from the fire-extinguishing agent pump to each energy storage battery E, the fire-fighting pipeline 532 is arranged specifically according to the installation condition of the battery cluster module 21, different branches 532c of the plurality of branches 532c can be arranged to extend to different energy storage batteries E, and fire-extinguishing agent outlets on the fire-fighting pipeline 532 are aligned to the energy storage batteries E. The pipeline electric control valve 533 is used for controlling the on-off of the fire-fighting pipeline 532, and can prevent the fire-extinguishing agent from volatilizing to the energy storage battery E when the fire-extinguishing agent is not used. The electrically controlled pipeline valve 533 may be disposed at different positions of the fire-fighting pipeline 532 according to needs, for example, the fire-fighting pipeline 532 includes a main pipeline 532a and branch pipelines 532b, the branch pipelines 532b are branches 532c of the main pipeline 532a, one end of each branch pipeline 532b, which is not connected to the main pipeline 532a, is connected to the second metal case, and the electrically controlled pipeline valve 533 is disposed on the main pipeline 532a or may be disposed on a plurality of branch pipelines 532b respectively. If the fire control controller 52 determines that a fire action is required, the fire control host 534 is controlled to start the fire extinguishing agent pump and open the corresponding pipeline electric control valve 533 to deliver the fire extinguishing agent from the fire extinguishing agent container 53 to the energy storage battery E through the fire control pipeline 532. In some embodiments, the fire execution module further includes a bleed no-in alert 536 for alerting others not to approach when performing the fire extinguishing action. In some embodiments, the material of the fire line is an insulating rubber material.
In one embodiment, as shown in fig. 3, the fire execution module further includes an alarm 535 connected to a fire host 534, and the fire host 534 is further configured to control the alarm 535 to issue alarm information according to the control signal.
Specifically, the alarm 535 is used for alarming in the case of low risk of the energy storage battery E, and may send out different alarm information, such as different sound alarm information, or different color light alarm information, or represent different risk levels in the form of sound alarm, light alarm, or a combination of the two. In some embodiments, the alarm 535 is an audible and visual alarm 535, which may sound and/or light based on different hazard levels.
In one embodiment, as shown in fig. 6, further comprising a battery energy management module including a battery management unit 61, a junction box management unit 62, a third photoelectric conversion module, a fourth photoelectric conversion module, and a battery controller 65; the battery management unit 61 is connected with the junction box management unit 62, and is used for monitoring and storing the working state of the battery E, the junction box management unit 62 is connected with a third photoelectric conversion module, the third photoelectric conversion module is connected with a fourth photoelectric conversion module through optical fibers, and the fourth photoelectric conversion module is connected with the battery controller 65; the battery controller 65 is used for acquiring and controlling the operating state of the energy storage battery E.
Specifically, the charge and discharge control of the battery cluster module 21 needs to be controlled by a battery energy management module, and the battery management unit 61 is for monitoring and acquiring the operation parameters of the energy storage battery E of the battery cluster module 21. The number of battery management units 61 is the same as the number of energy storage batteries E, i.e. the operating parameters of each energy storage battery E are monitored by its corresponding one of the battery management units 61. The plurality of battery management units 61 are connected in series with each other and then connected with the junction box management unit 62, the junction box management unit 62 is used for receiving the operation parameter data of the energy storage batteries E transmitted by the battery management unit 61, transmitting the operation parameter data to the battery controller 65 through the third photoelectric conversion module and the fourth photoelectric conversion module, the battery controller 65 determines a battery operation instruction for controlling the energy storage batteries E according to the operation parameter data, the battery control signal is distributed to the battery management unit 61 through the fourth photoelectric conversion module, the third photoelectric conversion module and the junction box management unit 62 in sequence, and the battery management unit 61 controls the working state of each energy storage battery E according to the battery operation instruction. In some embodiments, the third photoelectric conversion module is the first photoelectric conversion module 55, and the fourth photoelectric conversion module is the second photoelectric conversion module, that is, the third photoelectric conversion module is the same device as the first photoelectric conversion module 55, and the fourth photoelectric conversion module is the same device as the second photoelectric conversion module.
In one embodiment, the junction box management unit 62 is disposed within the high voltage junction box 66, and the high voltage junction box 66 is disposed on the metal bracket 41, so that the box body of the high voltage junction box 66 is connected with the metal bracket 41 in an equipotential manner. The high-voltage junction box 66 is provided with a plurality of switch protection devices, and the high-voltage junction box 66 serves as a primary and secondary external interface device of the battery cluster module 21 to perform wiring and protection functions. In some embodiments, a third resistor R3 connected to the battery cluster module 21 is disposed within the high voltage junction box 66. In some embodiments, the battery management unit 61, the high voltage junction box 66, and the third photoelectric conversion module are disposed on the metal bracket 41, and the fourth photoelectric conversion module is mounted close to the battery controller 65.
In one embodiment, as shown in fig. 7, the power module assembly further includes a first insulating support 42, and the plurality of power modules 11 are connected in series with each other, and the plurality of power modules 11 are disposed on the first insulating support 42.
Specifically, the first insulating support 42 is used to mount the power modules 11, and since each unit module of the chain energy storage system has a plurality of power modules 11, the plurality of power modules 11 are mounted simultaneously using the first insulating support 42. The power modules 11 are connected in series to form the power conversion valve group 1, and the power modules 11 are arranged on the first insulating support 42 so that a preset insulating distance between the power modules 11 and the ground, namely, an electric distance and a creepage distance specified by a standard are met. The material of the first insulating support 42 is SMC (Sheet molding compound) composite material, which has good insulation and arc resistance, can ensure that the electric safety distance of the chain energy storage system meets the use requirement, and meanwhile, the extremely low hygroscopicity, high flame retardance and excellent mechanical property of the material ensure the stability of the mechanical structure of the chain energy storage system, and ensure the operation safety of the chain energy storage system.
In one embodiment, as shown in fig. 6, a second insulation support 43 is further included, and the second insulation support 43 is used to support the metal support 41 such that the metal support 41 and the battery cluster module 21 on the metal support 41 satisfy a preset insulation distance from the ground. The material of the second insulating holder 43 is an SMC composite material.
In one embodiment, as shown in fig. 3 and 6, since one battery cluster module 21 is connected in parallel to each power module 11, the number of battery cluster modules 21 is the same as the number of power modules 11. The battery cluster modules 21 are provided with a plurality of battery cluster modules 21, each battery cluster module 21 is installed on one metal support 41, the plurality of metal supports 41 are divided into two rows, the two rows of metal supports 41 are arranged in a back-to-back mode, and a space is reserved between the two rows of metal supports 41, the space is used as a heat dissipation air channel for heat dissipation of the energy storage battery E, a fan 7 is arranged at the upper part of the heat dissipation air channel, and the fan 7 is used for accelerating heat dissipation of the energy storage battery E. In some embodiments, the plurality of metal brackets 41 are paired in pairs, the two metal brackets 41 in each pair are respectively located in two different rows, for the two metal brackets 41 in each pair, the two metal brackets 41 are arranged opposite to each other with a space between the two metal brackets 41, meanwhile, two third insulating brackets 44 are vertically arranged at the sides of the space, the space is surrounded by the two third insulating brackets 44 and the back parts of the two metal brackets 41 to form a heat dissipation air duct, and the fan 7 is arranged at the upper part of the heat dissipation air duct. The material of the third insulating holder 44 is an SMC composite material.
In one embodiment, as shown in fig. 6, the third insulating support 44 is higher than the metal support 41, the fire-fighting pipeline 532 includes a main pipeline 532a and branch pipelines 532b, the main pipeline 532a passes through a part of the third insulating support 44 higher than the metal support 41, and is fixed on the third insulating support 44, the branch pipelines 532b extend from the main pipeline 532a towards the metal support 41 and are fixed on the metal support 41, each branch pipeline 532b is controlled to be opened and closed by a pipeline electric control valve 533, and the pipeline electric control valve 533 is mounted on the metal support 41. Each branch line 532b further has a plurality of branches 532c, and ends of the branches 532c are connected to the second metal case. In some embodiments, the fire extinguishing agent is a non-conductive, non-flammable and volatile liquid, and a nozzle 537 is disposed at the end of each branch 532c, so that the fire extinguishing agent is atomized rapidly after being sprayed out through the nozzle 537, and can effectively cool down and extinguish fire.
In one embodiment, the transformer further comprises an isolation power supply 8, wherein the isolation power supply 8 is an insulation casting type isolation transformer, and the primary side and secondary side voltage resistance of the transformer meets the equipment use requirement. The isolation power supply 8 is used for supplying power to the battery energy management module and the fire protection system, and is also used for supplying power to the fan 7, so that the low-voltage power supply environment and the high-voltage power supply environment can be effectively isolated, and the power supply is not influenced by the high-voltage environment. In some embodiments, the isolated power supply 8 is mounted on a metal bracket 41.
In one embodiment, the chain energy storage device is arranged in a prefabricated integrated house 9, the prefabricated integrated house 9 is a factory prefabricated welded totally enclosed room, the prefabricated integrated house 9 is a square house, and an industrial temperature control device 91 is arranged on the outer wall surface of the prefabricated integrated house 9, and the industrial temperature control device 91 is used for controlling the temperature in the prefabricated integrated house 9. The prefabricated integrated house 9 is provided with a door opening, integrated with video monitoring, lighting, an environment sensor and a grounding row reserved outside the whole room.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. The chain type energy storage system is characterized by comprising a power conversion valve group, a battery array and a metal shell, wherein the power conversion valve group comprises a plurality of power modules, the battery array comprises a plurality of battery cluster modules, and the power modules and the battery modules are arranged in the metal shell; the metal shell is not grounded;
each power module is connected with one battery module in parallel, and the connection point of the power module and the battery module is connected with the metal shell.
2. The chain energy storage system of claim 1, wherein the connection points comprise a positive connection point and a negative connection point, a first resistor is connected between the positive connection point and the metal shell, a second resistor is connected between the negative connection point and the metal shell, and the resistance value of the first resistor is equal to the resistance value of the second resistor.
3. The chain-type energy storage system of claim 2, wherein the metal housing comprises a first metal housing and a second metal housing, the power module, the first resistor, and the second resistor being disposed within the first metal housing, the first metal housing being connected to a series midpoint of the first resistor and the second resistor; the battery cluster module comprises a plurality of energy storage batteries, each energy storage battery is respectively arranged in a second metal shell, and a third resistor is connected between the second metal shell and the connecting point.
4. The chain energy storage system of claim 1, wherein the power module comprises: the H-bridge circuit, the direct-current capacitor, the control driving unit, the power controller and the driving control power supply; the H bridge circuit is connected with the direct-current capacitor in parallel, a switching tube of the H bridge circuit is connected with the control driving unit, the control driving unit is connected with the power controller through optical fibers, and the control driving unit is connected with the secondary side of the driving control power supply; the primary side of the drive control power supply is connected with the direct current capacitor in parallel.
5. The chain energy storage system of claim 3, further comprising a metal bracket on which the plurality of energy storage cells are disposed, the metal bracket in contact with the second metal housing.
6. The chain energy storage system of claim 1, further comprising an energy storage battery cluster fire system, the energy storage battery cluster fire system comprising:
the fire control monitoring module is used for acquiring the environmental data of the battery cluster module;
the fire control controller is connected with the fire control monitoring module and is used for outputting control signals according to the environmental data;
and the fire control execution module is connected with the fire control controller and is used for alarming according to the control signal or executing fire control actions on the energy storage batteries of the battery cluster module.
7. The chain energy storage system of claim 6, wherein the energy storage battery cluster fire protection system further comprises a relay module, a first photoelectric conversion module and a second photoelectric conversion module, the relay module is respectively connected with the fire protection monitoring module, the fire protection execution module and the first photoelectric conversion module, and the first photoelectric conversion module is connected with the second photoelectric conversion module through optical fibers; the second photoelectric conversion module is connected with the fire control controller.
8. The chain energy storage system of claim 6, wherein the fire execution module comprises: the fire extinguishing agent comprises a fire extinguishing agent container, a fire extinguishing agent pump, a fire extinguishing pipeline, a pipeline electric control valve and a fire extinguishing host; the fire extinguishing agent container is used for storing fire extinguishing agent, the fire extinguishing agent pump is connected with the fire extinguishing agent container and the fire extinguishing pipeline, and the fire extinguishing agent pump is used for conveying the fire extinguishing agent into the fire extinguishing pipeline; the fire line extends from the fire suppressant pump to the battery cluster module; the pipeline electric control valve is arranged on the fire-fighting pipeline and is used for controlling the on-off of the fire-fighting pipeline; the fire-fighting host is respectively connected with the pipeline electric control valve, the fire-extinguishing agent pump and the fire-fighting controller, and is used for controlling the fire-extinguishing agent pump to be started and the pipeline electric control valve to be started according to the control signal so as to convey the fire-extinguishing agent pump to the energy storage battery of the battery cluster module.
9. The chain energy storage system of claim 1, further comprising a battery energy management module comprising a battery management unit, a third photoelectric conversion module, a fourth photoelectric conversion module, and a battery controller; the battery management unit is connected with the third photoelectric conversion module and is used for monitoring the working state of the energy storage battery, the third photoelectric conversion module is connected with the fourth photoelectric conversion module through optical fibers, and the fourth photoelectric conversion module is connected with the battery controller; the battery controller is used for acquiring and controlling the working state of the energy storage battery.
10. The chain energy storage system of any one of claims 1-9, further comprising a first insulating support, the plurality of power modules being connected in series with each other, the plurality of power modules being disposed on the first insulating support.
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